节能降碳_2022_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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节能降碳

农业废弃物在混凝土中的资源化利用研究进展

张思雨1，屈晓明2，李长江1，于琦1，许冬1，罗金垒3

2022年第8期

摘要

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摘要：介绍了农业废弃物在资源化利用过程中存在的问题及在混凝土中的应用研究现状，并提出了相应的改善措施，可为拓宽农业废弃物的资源化利用途径提供参考，并推进我国乡村生态振兴建设和碳中和进程。 Abstract: The problems existing in the process of resource utilization of agricultural waste and the research status of its application in concrete are introduced, and the corresponding improvement measures are put forward, which can provide a reference for broadening the resource utilization of agricultural waste, and further promote the process of rural ecological revitalization and carbon neutrality in China.

张思雨,屈晓明,李长江,等.农业废弃物在混凝土中的资源化利用研究进展[J].混凝土与水泥制品,2022(8):101-104. ZHANG S Y,QU X M,LI C J,et al.Research Progress on Resource Utilization of Agricultural Waste in Concrete[J].China Concrete and Cement Products,2022(8):101-104.

机制砂混凝土抗压强度分析及预测

陶松涛1,2，延永东1，郑玉龙1，刘甲琪1，梁晓封1，王鑫1

2022年第8期

摘要

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摘要：为了探究机制砂混凝土的抗压强度变化规律，进行了不同机制砂替代率（0、30%、50%、70%）、粉煤灰掺量（0、20%、30%、40%）和机制砂石粉含量（0、5.8%、11.6%）混凝土试件的抗压强度试验，并结合试验数据建立了BP神经网络模型预测抗压强度。结果表明：随着机制砂替代率的增加，试件的7 d、28 d抗压强度呈先增大后减小的趋势，且在机制砂替代率为50%时达到最大，机制砂替代率对试件的60 d抗压强度影响较小；掺入粉煤灰使试件的早期抗压强度降低，但30%掺量的粉煤灰有利于提高试件的60 d抗压强度；随着机制砂石粉含量的增加，试件的7 d抗压强度先增大后减小，28 d、60 d抗压强度则逐渐增大；建立的机制砂混凝土28 d抗压强度预测模型的精度较高。 Abstract： In order to explore the change law of the compressive strength of manufactured sand concrete, the compressive strength tests of concrete specimens with different manufactured sand replacement rates(0, 30%, 50%, 70%), fly ash contents(0, 20%, 30%, 40%) and stone powder contents(0, 5.8%, 11.6%) in manufactured sand were carried out. Combined with the test datas, the BP neural network model was established to predict the compressive strength. The results show that the 7 d and 28 d compressive strength of the specimen increase first and then decrease with the increase of manufactured sand replacement rate, and reaches the maximum when the manufactured sand replacement rate is 50%. The manufactured sand replacement rate has little effect on the 60 d compressive strength of the specimen. Adding fly ash reduces the early compressive strength of the specimen, but 30% fly ash is beneficial to improve the 60 d compressive strength of the specimen. With the increase of stone powder content in manufactured sand, the 7 d compressive strength of the specimen first increases and then decreases, and the 28 d and 60 d compressive strength increase gradually. The established model for predicting the 28 d compressive strength of manufactured sand concrete has high accuracy.

陶松涛,延永东,郑玉龙,等.机制砂混凝土抗压强度分析及预测[J].混凝土与水泥制品,2022(8):96-100,104. TAO S T,YAN Y D,ZHENG Y L,et al.Analysis and Prediction of Compressive Strength of Manufactured Sand Concrete[J].China Concrete and Cement Products,2022(8):96-100,104.

玻璃粉-粉煤灰基地聚合物混凝土力学及微观性能研究

陈剑刚1，潘泽滨2，马云龙1，舒本安1，成浩1，杨腾宇1

2022年第8期

摘要

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摘要：研究了玻璃粉的粒径和取代率、复合碱激发剂的模数和浓度对玻璃粉-粉煤灰基地聚合物混凝土（GAGC）力学性能和微观结构的影响。结果表明：随着玻璃粉取代率的增加，GAGC的抗压强度呈先增大后减小的趋势，最佳取代率为40%；随着玻璃粉粒径的增大，GAGC体系中的凝胶体和团簇结构减少，微观结构由密实转为松散，力学性能降低，最优粒径为（10±2）μm；随着复合碱激发剂模数和浓度的增大，GAGC的抗压强度呈先增大后减小的趋势，最佳模数和浓度分别为1.5和1.4 mol/kg。 Abstract: The effects of particle size and substitution rate of glass powder, modulus and concentration of composite alkali activator on the mechanical properties and microstructure of glass powder and fly ash based geopolymer concrete (GAGC) were studied. The results show that the compressive strength of GAGC increases first and then decreases with the increase of glass powder substitution rate, and the optimal substitution rate is 40%. With the increase of glass powder particle size, the gel and cluster structures in GAGC system decrease, the microstructure changes from dense to loose, and the mechanical properties decrease, and the optimal particle size is(10±2)μm. With the increase of the modulus and concentration of composite alkali activator, the compressive strength of GAGC increases first and then decreases, and the optimal modulus and concentration are 1.5 and 1.4 mol/kg respectively.

陈剑刚,潘泽滨,马云龙,等.玻璃粉-粉煤灰基地聚合物混凝土力学及微观性能研究[J].混凝土与水泥制品,2022(8):91-95. CHEN J G,PAN Z B,MA Y L,et al.Study on Mechanical and Microscopic Properties of Glass Powder and Fly Ash Based Geopolymer Concrete[J].China Concrete and Cement Products,2022(8):91-95.

高性能复合矿物掺合料的制备及胶砂性能研究

李仕彬1，王文涛1，黄从运2，马继汉2

2022年第8期

摘要

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摘要：分析了矿渣、钢渣、建筑垃圾和循环灰的活性，研究了活化剂的类型（M型、N型、P型、Q型）和掺量对掺矿物合料胶砂性能的影响，通过SEM和XRD分析了活化剂的作用机理。结果表明：4种矿物掺合料中，矿渣的活性指数最大，而循环灰的活性指数最小；不同类型的活化剂均能有效提高掺复合矿物掺合料胶砂的强度，其中，P型活化剂的提高效果最好，其适宜掺量为2.5%；活化剂的掺入促进了AFt和C-S-H凝胶的生成，从而提升了强度。 Abstract: The activity of slag, steel slag, construction waste and circulating ash were analyzed. The effects of the type (M-type, N-type, P-type, Q-type) and content of activator on the properties of mortar mixed with composite mineral admixtures were studied. The action mechanism of activators was analyzed by SEM and XRD. The results show that among the four mineral admixtures, the activity index of slag is the largest, while that of circulating ash is the smallest. Different types of activators can effectively improve the strength of mortar mixed with composite mineral admixtures. Among them, the P-type activator has the best effect, and its appropriate content is 2.5%. The activator promotes the formation of AFt and C-S-H gel, thus enhancing the strength.

李仕彬,王文涛,黄从运,等.高性能复合矿物掺合料的制备及胶砂性能研究[J].混凝土与水泥制品,2022(8):87-90,95. LI S B,WANG W T,HUANG C Y,et al.Study on Preparation of High Performance Composite Mineral Admixtures and Properties of Mortar[J].China Concrete and Cement Products,2022(8):87-90,95.

盾构隧道回填用自流平泡沫混凝土试验研究

李春宝1，李笑天1，李申2，管笛2，肖畅1，秦鹏举3，丛子钦1，张建华4

2022年第8期

摘要

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摘要：通过正交试验研究了水灰比、HTFC掺合料、减水剂、发泡剂对泡沫混凝土性能的影响，改进了用于输送、生产和浇筑的施工设备。结果表明，各因素对泡沫混凝土流动度的影响顺序大小为：发泡剂掺量＞水灰比>减水剂掺量>HTFC掺合料掺量。满足实际施工要求的自流平泡沫混凝土的配合比为：水灰比0.5~0.6、HTFC掺合料掺量35%~40%、减水剂掺量1.00%、发泡剂掺量3.0%~3.5%。 Abstract: The effects of water-cement ratio, HTFC admixtures, water reducing agent and foaming agent on the properties of foamed concrete were studied through orthogonal test, and the construction equipments for transportation, production and pouring were improved. The results show that the influence order of various factors on the fluidity of foamed concrete is as follows: foaming agent content > water-cement ratio > water reducing agent content > HTFC admixture content. The mix proportion of self-leveling foamed concrete meeting the actual construction requirements is that the water-cement ratio is 0.5~0.6, the HTFC admixture content is 35%~40%, the water reducing agent content is 1.00%, and the foaming agent content is 3.0%~3.5%.

李春宝,李笑天,李申,等.盾构隧道回填用自流平泡沫混凝土试验研究[J].混凝土与水泥制品,2022(8):83-86. LI C B,LI X T,LI S,et al.Experimental Study on Self-leveling Foamed Concrete For Shield Tunne Backfill[J].China Concrete and Cement Products,2022(8):83-86.

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